As long as they are using RSI mode, (using either 2- or 4-wire RS-485 connections) then yes, they can daisy chain PIM400-485 and gateways in the same chain. Just make sure the PIMs and gateway's addresses are correct and the highs and lows are properly set.
The gateway can only connect to NDEs and LEs. Not AD400s. AD400s can only link to PIMs
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